Robust Control and Rate Coordination for Eeciency and Fairness in Abr Traac with Explicit Rate Marking 1

The problem of eeciency and fairness of ABR (Available Bit Rate) traac with explicit rate marking is investigated from a control point of view. It is revealed that due to signiicant uncertainty on time delays in ABR traac and strong interaction among switches, ABR traac imposes a great challenge to control strategy development. Focusing on robustness of traac control and asymptotic fairness, we propose a new control strategy that employs robust control to accommodate delay uncertainty and rate coordination for fairness. Conditions are presented under which robust stability and convergence are guaranteed.